1257071 has 2 divisors, whose sum is σ = 1257072. Its totient is φ = 1257070.

The previous prime is 1257049. The next prime is 1257073. The reversal of 1257071 is 1707521.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1707521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1257071 - 2¹⁸ = 994927 is a prime.

Together with 1257073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628535 + 628536.

It is an arithmetic number, because the mean of its divisors is an integer number (628536).

2^1257071 is an apocalyptic number.

1257071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257071 is an equidigital number, since it uses as much as digits as its factorization.

1257071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 1257071 is about 1121.1917766377. The cubic root of 1257071 is about 107.9244728000.

The spelling of 1257071 in words is "one million, two hundred fifty-seven thousand, seventy-one".